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A193437 as a simple table

na(n)
01
11
21
31
47
531
691
7931
87441
938017
10507241
115864761
1243501591
13713059711
1410776989587
15105784464331
162052437475361
1738263122487681
18469863736958161
1910518597616325617
20232980391759702951
213446848352553524191
2287385257330831947851

[1,1,1,1,7,31,91,931,7441,38017,507241,5864761,
 43501591,713059711,10776989587,105784464331,
 2052437475361,38263122487681,469863736958161,
 10518597616325617,232980391759702951,
 3446848352553524191,87385257330831947851]